Use PEP 585 syntax in Python 2, protobuf & _ast stubs, where possible (#6949)

stdlib/@python2/abc.pyi

@@ -1,6 +1,6 @@
 import _weakrefset
 from _typeshed import SupportsWrite
-from typing import Any, Callable, Dict, Set, Tuple, Type, TypeVar
+from typing import Any, Callable, TypeVar
 
 _FuncT = TypeVar("_FuncT", bound=Callable[..., Any])
 
@@ -15,11 +15,11 @@ class ABCMeta(type):
     _abc_negative_cache: _weakrefset.WeakSet[Any]
     _abc_negative_cache_version: int
     _abc_registry: _weakrefset.WeakSet[Any]
-    def __init__(self, name: str, bases: Tuple[type, ...], namespace: Dict[str, Any]) -> None: ...
+    def __init__(self, name: str, bases: tuple[type, ...], namespace: dict[str, Any]) -> None: ...
     def __instancecheck__(cls: ABCMeta, instance: Any) -> Any: ...
     def __subclasscheck__(cls: ABCMeta, subclass: Any) -> Any: ...
     def _dump_registry(cls: ABCMeta, file: SupportsWrite[Any] | None = ...) -> None: ...
-    def register(cls: ABCMeta, subclass: Type[Any]) -> None: ...
+    def register(cls: ABCMeta, subclass: type[Any]) -> None: ...
 
 # TODO: The real abc.abstractproperty inherits from "property".
 class abstractproperty(object):